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memcg: add mem_cgroup_same_or_subtree() helper 

We are checking whether a given two groups are same or at least in the
same subtree of a hierarchy at several places.  Let's make a helper for
it to make code easier to read.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko 2011-07-26 16:08:29 -07:00 committed by Linus Torvalds
parent d38144b7a5
commit 3e92041d68
1 changed files with 26 additions and 25 deletions
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51
mm/memcontrol.c
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@ -1108,6 +1108,21 @@ void mem_cgroup_move_lists(struct page *page,
mem_cgroup_add_lru_list(page, to);
}
/*
* Checks whether given mem is same or in the root_mem's
* hierarchy subtree
*/
static bool mem_cgroup_same_or_subtree(const struct mem_cgroup *root_mem,
struct mem_cgroup *mem)
{
if (root_mem != mem) {
return (root_mem->use_hierarchy &&
css_is_ancestor(&mem->css, &root_mem->css));
}
return true;
}
int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
{
int ret;
@ -1127,10 +1142,7 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
* enabled in "curr" and "curr" is a child of "mem" in *cgroup*
* hierarchy(even if use_hierarchy is disabled in "mem").
*/
if (mem->use_hierarchy)
ret = css_is_ancestor(&curr->css, &mem->css);
else
ret = (curr == mem);
ret = mem_cgroup_same_or_subtree(mem, curr);
css_put(&curr->css);
return ret;
}
@ -1369,10 +1381,9 @@ static bool mem_cgroup_under_move(struct mem_cgroup *mem)
to = mc.to;
if (!from)
goto unlock;
if (from == mem || to == mem
|| (mem->use_hierarchy && css_is_ancestor(&from->css, &mem->css))
|| (mem->use_hierarchy && css_is_ancestor(&to->css, &mem->css)))
ret = true;
ret = mem_cgroup_same_or_subtree(mem, from)
|| mem_cgroup_same_or_subtree(mem, to);
unlock:
spin_unlock(&mc.lock);
return ret;
@ -1915,25 +1926,20 @@ struct oom_wait_info {
static int memcg_oom_wake_function(wait_queue_t *wait,
unsigned mode, int sync, void *arg)
{
struct mem_cgroup *wake_mem = (struct mem_cgroup *)arg;
struct mem_cgroup *wake_mem = (struct mem_cgroup *)arg,
*oom_wait_mem;
struct oom_wait_info *oom_wait_info;
oom_wait_info = container_of(wait, struct oom_wait_info, wait);
oom_wait_mem = oom_wait_info->mem;
if (oom_wait_info->mem == wake_mem)
goto wakeup;
/* if no hierarchy, no match */
if (!oom_wait_info->mem->use_hierarchy || !wake_mem->use_hierarchy)
return 0;
/*
* Both of oom_wait_info->mem and wake_mem are stable under us.
* Then we can use css_is_ancestor without taking care of RCU.
*/
if (!css_is_ancestor(&oom_wait_info->mem->css, &wake_mem->css) &&
!css_is_ancestor(&wake_mem->css, &oom_wait_info->mem->css))
if (!mem_cgroup_same_or_subtree(oom_wait_mem, wake_mem)
&& !mem_cgroup_same_or_subtree(wake_mem, oom_wait_mem))
return 0;
wakeup:
return autoremove_wake_function(wait, mode, sync, arg);
}
@ -2178,13 +2184,8 @@ static void drain_all_stock(struct mem_cgroup *root_mem, bool sync)
mem = stock->cached;
if (!mem || !stock->nr_pages)
continue;
if (mem != root_mem) {
if (!root_mem->use_hierarchy)
continue;
/* check whether "mem" is under tree of "root_mem" */
if (!css_is_ancestor(&mem->css, &root_mem->css))
continue;
}
if (!mem_cgroup_same_or_subtree(root_mem, mem))
continue;
if (!test_and_set_bit(FLUSHING_CACHED_CHARGE, &stock->flags)) {
if (cpu == curcpu)
drain_local_stock(&stock->work);